Design of a Delta-Sigma Modulator structured in MASH 2-1-2 with dither of error feedback

Author

Huang, Yue Cheng ; Wang, Zhi Gang ; Liu, Wen Feng ; Zheng, Xing

Author_Institution

Sch. of Autom. Eng., Univ. of Electron. Sci. & Technol. of China, Chengdu, China

fYear

2011

fDate

14-16 Dec. 2011

Firstpage

33

Lastpage

36

Abstract

This paper presents a novel Delta Sigma Modulator (DSM) in form of MASH 2-1-2, which can suppress the spurious tones in spectrum for all constant inputs with error feedback as dither. As a finite-state machine (FSM), DSM always outputs a periodic sequence (or cycle) with a constant input. However, the novel DSM was designed to break up the periodic cycles and suppress quantization noise occurred in the fractional-N frequency synthesizer. Starting from the linear model of DSM, the principle of noise shaping was analyzed and logic implementation is introduced in detail. The performance is confirmed mathematically, by simulation, and experimental results.

Keywords

delta-sigma modulation; finite state machines; frequency synthesizers; network synthesis; DSM; FSM; MASH 2-1-2; delta-sigma modulator; error feedback; finite-state machine; fractional-N frequency synthesizer; logic implementation; quantization noise; Multi-stage noise shaping; Phase locked loops; MASH; delta sigma modulator (DSM); dither; error feedback; fractional division;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Superconductivity and Electromagnetic Devices (ASEMD), 2011 International Conference on

Conference_Location

Sydney, NSW

Print_ISBN

978-1-4244-7852-1

Type

conf

DOI

10.1109/ASEMD.2011.6145061

Filename

6145061